Exciton ionization by THz pulses in germanium

After optical pumping, strong single cycle THz pulses are used to probe and manipulate excitons in bulk germanium. For strong THz fields a significant broadening and bleaching of the 1s-2p THz absorption peak is observed. The experimental results are analyzed using a microscopic many-body theory att...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2018-08, Vol.51 (15), p.154001
Main Authors: Stein, M, Lammers, C, Steiner, J T, Richter, P-H, Koch, S W, Koch, M, Kira, M
Format: Article
Language:English
Subjects:
excitons
semiconductor physics
THz spectroscopy
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Summary:After optical pumping, strong single cycle THz pulses are used to probe and manipulate excitons in bulk germanium. For strong THz fields a significant broadening and bleaching of the 1s-2p THz absorption peak is observed. The experimental results are analyzed using a microscopic many-body theory attributing the observations to a shortening of the excitonic state lifetime and eventual exciton ionization. Simultaneously, the ac THz Stark effect leads to a shift in the 1s-2p transition energy.
ISSN:0953-4075
1361-6455
DOI:10.1088/1361-6455/aabac7